Seat and back support for collapsible chair



FIG. 1 is a perspective view showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a top view thereof showing the seat and back support for collapsible chair of my new design displaced in flat-laid condition; and,

FIG. 7 is a bottom view thereof showing the seat and back support for collapsible chair of may new design displaced in flat-laid condition. 

The ornamental design for a seat and back support for collapsible chair, as shown and described. 